//package com.roc.template.shiro.jwt;
//
//import org.apache.shiro.authc.AuthenticationException;
//import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;
//import org.springframework.http.HttpStatus;
//import org.springframework.web.bind.annotation.RequestMethod;
//
//import javax.servlet.ServletRequest;
//import javax.servlet.ServletResponse;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//
///**
// * @ClassName ShiroSSOFilter
// * @Description: TODO
// * @Author Administrator
// * @Date 2020/7/23 10 15
// * @Version V1.0
// **/
//public class JwtFilter extends BasicHttpAuthenticationFilter {
//
//    protected Logger logger = LoggerFactory.getLogger(this.getClass());
//
//    /**
//     * 执行登录认证(判断请求头是否带上token)
//     * @param request
//     * @param response
//     * @param mappedValue
//     * @return
//     */
//    @Override
//    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
//        //如果请求头不存在token,则可能是执行登陆操作或是游客状态访问,直接返回true
//        if (isLoginAttempt(request, response)) {
//            return true;
//        }
//        //如果存在,则进入executeLogin方法执行登入,检查token 是否正确
//        try {
//            executeLogin(request, response);return true;
//        } catch (Exception e) {
//            throw new AuthenticationException("Token失效请重新登录");
//        }
//    }
//
//    /**
//     * 判断用户是否是登入,检测headers里是否包含token字段
//     */
//    @Override
//    protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
//        HttpServletRequest req = (HttpServletRequest) request;
//        String token = req.getHeader("token");
//        if (token == null) {
//            return false;
//        }
//        return true;
//    }
//
//    /**
//     * 重写AuthenticatingFilter的executeLogin方法丶执行登陆操作
//     */
//    @Override
//    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
//        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
//        String token = httpServletRequest.getHeader("token");//Access-Token
//        JwtToken jwtToken = new JwtToken(token);
//        // 提交给realm进行登入,如果错误他会抛出异常并被捕获, 反之则代表登入成功,返回true
//        getSubject(request, response).login(jwtToken);return true;
//    }
//
//    /**
//     * 对跨域提供支持
//     */
//    @Override
//    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
//        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
//        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
//        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
//        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
//        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
//        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
//            httpServletResponse.setStatus(HttpStatus.OK.value());
//            return false;
//        }
//        return super.preHandle(request, response);
//    }
//}
